US Patent Class 331
OSCILLATORS



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Current as of: June, 1999
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  DF  CLASS NOTES
94.1  DF  MOLECULAR OR PARTICLE RESONANT TYPE (E.G., MASER)
1 R  DF  AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS
2  DF  .~ Plural oscillators controlled
3  DF  .~ Molecular resonance stabilization
4  DF  .~ Search sweep of oscillator
5  DF  .~ Magnetron oscillator
6  DF  .~ Klystron oscillator
7  DF  .~.~ Plural controls
8  DF  .~ Transistorized controls
9  DF  .~ Oscillator with distributed parameter-type discriminator
10  DF  .~ Plural A.F.S. for a single oscillator
11  DF  .~.~ Plural comparators or discriminators
12  DF  .~.~.~ With phase-shifted inputs
13  DF  .~.~ Motor control of oscillator
14  DF  .~ With intermittent comparison controls
15  DF  .~ Amplitude compensation
16  DF  .~ Tuning compensation
17  DF  .~ Particular error voltage control (e.g., intergrating network)
18  DF  .~ With reference oscillator or source
19  DF  .~.~ Spectrum reference source
20  DF  .~.~ T.V. sync type
21  DF  .~.~.~ Lock to power line
22  DF  .~.~ Plural significant heterodyne stages
23  DF  .~.~ Sensing modulation (e.g., frequency modulation controlled oscillator
24  DF  .~.~.~ With motor comparator
25  DF  .~.~ Signal or phase comparator
26  DF  .~.~.~ Plural diode type
27  DF  .~.~.~ Plural active element (e.g., triodes)
28  DF  .~.~.~ Unilateral element (e.g., diode)
29  DF  .~.~.~ Electromechanical
30  DF  .~ With stable heterodyne oscillator or source
31  DF  .~.~ Plural significant heterodyne stages
32  DF  .~.~ With particular discriminator (e.g., LPF and HPF)
33  DF  .~.~.~ Plural diode type
34  DF  .~ Particular frequency control means
35  DF  .~.~ Electromechanical (e.g., motor)
36 R  DF  .~.~ Reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.)
36 C  DF  .~.~.~ Capacitor controlled AFC
36 L  DF  .~.~.~ Inductor controlled AFC
1 A  DF  .~ AFC with logic elements
37  DF  BEAT FREQUENCY
38  DF  .~ Plural beating
39  DF  .~.~ Single channel
40  DF  .~ Frequency or amplitude adjustment or control
41  DF  .~ Frequency stabilization
42  DF  .~ With particular signal combining means (e.g., cavity mixer)
43  DF  .~.~ With filter in mixer output circuit
44  DF  WITH FREQUENCY CALIBRATION OR TESTING
45  DF  POLYPHASE OUTPUT
46  DF  PLURAL OSCILLATORS
47  DF  .~ Oscillator used to vary amplitude or frequency of another oscillator
48  DF  .~ Adjustable frequency
49  DF  .~ Selectively connected to common output or oscillator substitution
50  DF  .~ Cascade or tandem connected
51  DF  .~.~ Frequency dividers
52  DF  .~.~ Semiconductor (e.g., transistor)
53  DF  .~.~ Frequency multiplier
54  DF  .~.~ Diverse-type oscillators
55  DF  .~ Synchronized, triggered or pulsed
56  DF  .~ Parallel connected
57  DF  RING OSCILLATORS
58  DF  PLURAL FUNCTIONS SIMULTANEOUSLY
59  DF  CONVERTIBLE (E.G., OSCILLATOR TO AMPLIFIER, ETC.)
60  DF  SINGLE OSCILLATOR WITH PLURAL OUTPUT CIRCUITS
61  DF  .~ Plural outputs of diverse wave form
62  DF  WITH OSCILLATOR CIRCUIT PROTECTIVE MEANS
63  DF  PROTECTIVE OF SAFETY DEVICES FOR PERSONNEL
64  DF  WITH INDICATOR, SIGNAL, OR ALARM
65  DF  WITH DEVICE RESPONSIVE TO EXTERNAL PHYSICAL CONDITION
66  DF  .~ Temperature or light responsive
67  DF  WITH ELECTROMAGNETIC OR ELECTROSTATIC SHIELD
68  DF  WITH OUTER CASING OR HOUSING
69  DF  .~ With temperature modifier
70  DF  WITH TEMPERATURE MODIFIER
71  DF  RAW A.C. USED AS SOURCE OF POWER OR BIAS
72  DF  ELECTRON-COUPLED TYPE
73  DF  .~ Piezoelectric crystal resonator
74  DF  COMBINED WITH PARTICULAR OUTPUT COUPLING NETWORK
75  DF  .~ Space discharge or unilaterally conductive device in output network
76  DF  .~.~ Harmonic producing or selecting network
77  DF  .~ Wave filter
78  DF  ELECTRICAL NOISE OR RANDOM WAVE GENERATOR
79  DF  BEAM TUBE
80  DF  .~ With beam sweeping or deflecting means
81  DF  .~ With electron bunching or velocity variation means
82  DF  .~.~ Traveling wave type
83  DF  .~.~ Multicavity type (e.g., Klystron)
84  DF  .~.~ Reflex type (i.e., with repeller electrode)
86  DF  WITH MAGNETICALLY CONTROLLED SPACE DISCHARGE DEVICE (E.G., MAGNETRON)
87  DF  .~ With particular pulsing means
88  DF  .~ With frequency stabilization
89  DF  .~ With secondary emissive electrode
90  DF  .~ With frequency adjustment
91  DF  .~ With undesired mode suppression or selection means
92  DF  RETARDING FIELD TUBE-TYPE OSCILLATORS (E.G., BARKHAUSEN KURZ)
93  DF  .~ With distributed parameter resonator
95  DF  BUTTERFLY RESONATOR
96  DF  WITH DISTRIBUTED PARAMETER RESONATOR
97  DF  .~ Tube enclosed by resonator structure
98  DF  .~.~ Disk seal tube (e.g., lighthouse, pencil tube)
99  DF  .~ Parallel wire type
100  DF  .~.~ Push-pull type
101  DF  .~ Coaxial or shielded line type
102  DF  .~.~ Push-pull type
103  DF  TUBE STRUCTURE FORMS INDUCTIVE PART OF RESONANT CIRCUIT
104  DF  TRANSIT TIME OSCILLATOR
105  DF  WITH PARASITIC OSCILLATION CONTROL OR PREVENTION MEANS
106  DF  WITH PERIODOIC OR REPETITIOUS AMPLITUDE VARYING MEANS (E.G., TREMOLO)
107 R  DF  SOLID STATE ACTIVE ELEMENT OSCILLATOR
108 R  DF  .~ Transistors
109  DF  .~.~ Amplitude stabilization and control
110  DF  .~.~ Bridge type
111  DF  .~.~ Relaxation oscillator
112  DF  .~.~.~ Blocking oscillator type
113 R  DF  .~.~.~ Multivibrator type
113 A  DF  .~.~.~.~ Saturable core controlled converters
113 S  DF  .~.~.~.~ Converter using silicon control rectifiers
114  DF  .~.~ Push-pull
115  DF  .~.~ Negative resistance
116 R  DF  .~.~ Electromechanical resonator controlled
116 FE  DF  .~.~.~ Field-effect transistor active element
116 M  DF  .~.~.~ Electromechanical resonators other than piezoelectric crystals
117 R  DF  .~.~ L-C type
117 FE  DF  .~.~.~ Field-effect transistor active element
117 D  DF  .~.~.~ Distributed parameter resonator transistor oscillators
108 A  DF  .~.~ Use of complimentary-type transistors
108 B  DF  .~.~ Phase shift oscillator
108 C  DF  .~.~ Integrated circuit oscillators
108 D  DF  .~.~ Integrated modules with discrete elements oscillators
107 DP  DF  .~ Significant distributed parameter resonator (e.g., cavity)
107 P  DF  .~.~ Parallel-connected oscillator devices
107 SL  DF  .~.~ Stripline type
107 C  DF  .~.~ Coaxial type
107 A  DF  .~ Acoustoelectric device oscillators
107 G  DF  .~ Gunn-type bulk effect device oscillators
107 S  DF  .~ Superconductive device oscillators
107 T  DF  .~ Tunnel diode oscillators
126  DF  GASEOUS SPACE DISCHARGE DEVICE
127  DF  .~ Spark or open arc type
128  DF  .~ Drives shock excited L.C. circuit
129  DF  .~ Relaxation oscillator
130  DF  .~.~ Plural gaseous devices
131  DF  .~.~ Discharge device or rectifier in "C" or "L" charging or discharging circuit
132  DF  NEGATIVE RESISTANCE OR NEGATIVE TRANSCONDUCTANCE OSCILLATOR
133  DF  .~ Secondary emission (e.g., dynatron)
134  DF  .~ Transitron type
135  DF  PHASE SHIFT TYPE
136  DF  .~ Zero phase shift
137  DF  .~ With R.C. ladder-type phase shift network
138  DF  BRIDGE TYPE
139  DF  .~ Piezoelectric crystal in bridge
140  DF  .~ R.C. or R.L. type
141  DF  .~.~ Wien bridge
142  DF  .~.~ Double T bridge
143  DF  RELAXATION OSCILLATORS
144  DF  .~ Multivibrators
145  DF  .~.~ With sync, triggering or pulsing circuit
146  DF  .~ Blocking oscillators
147  DF  .~.~ Using discharge device with plural grids
148  DF  .~.~ With 3 or more winding feedback transformers
149  DF  .~.~ With sync, trigger, or pulsing circuit (e.g., self-pulsing)
150  DF  .~ Output supplied to another discharge device circuit
151  DF  .~ Involving resonant or inductive wave forming circuit or transformer
152  DF  .~ Multi-grid discharge device in charged capacitor circuit
153  DF  .~ With sync, trigger or pulsing circuit
154  DF  ELECTROMECHANICAL RESONATOR
155  DF  .~ With optical, piezoelectric or acoustic coupling means
156  DF  .~ Vibrating reed or string type (e.g., tuning fork)
157  DF  .~ Magnetostrictive
158  DF  .~ Crystal
159  DF  .~.~ Plural tube
160  DF  .~.~ With means to limit crystal current or voltage
161  DF  .~.~ With crystal substitution
162  DF  .~.~ Plural crystals in circuit
163  DF  .~.~ Crystal having three or more electrodes in circuit
164  DF  .~.~ Anode or cathode to grid crystal circuit
165  DF  SHOCK EXCITED RESONANT CIRCUIT
166  DF  .~ With keying means of the active element type (e.g., burst generator)
167  DF  L-C TYPE OSCILLATORS
168  DF  .~ Plural tubes
169  DF  .~ Anode to cathode coupled or connected resonant circuit
170  DF  .~ Anode to grid coupled or connected resonant circuit
171  DF  .~ Grid to cathode coupled or connected resonant circuit
172  DF  WITH SYNCHRONIZING, TRIGGERING OR PULSING CIRCUITS
173  DF  .~ Triggering or pulsing (e.g., burst generators)
174  DF  .~.~ Self-quenched
175  DF  FREQUENCY STABILIZATION
176  DF  .~ Temperature or current responsive means in circuit
177 R  DF  WITH FREQUENCY ADJUSTING MEANS
178  DF  .~ Cyclic frequency sweeping means (e.g., vibrato)
179  DF  .~ Step-frequency change (e.g., band selection, frequency-shift keying)
180  DF  .~ Reactance tube type
181  DF  .~ Variable inductance device (e.g., saturable core or adjustable vane inductor)
177 V  DF  .~ With voltage sensitive capacitor
182  DF  AMPLITUDE CONTROL OR STABILIZATION
183  DF  .~ Automatic
184  DF  HAVING DISCHARGED DEVICE OR PARTICULAR CONSTRUCTION
185  DF  WITH PARTICULAR SOURCE OF POWER OR BIAS VOLTAGE
186  DF  .~ Regulated
187  DF  MISCELLANEOUS OSCILLATOR STRUCTURES
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DIGESTS
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DIG 2  DD  Phase locked loop having lock indicating or detecting means
DIG 3  DD  Logic gate active element oscillator